Allen-Bradley 1785-L20B/E PLC-5 Processor Module
$123.00
$320.00
Description
Allen-Bradley 1785-L20B/E PLC-5 Processor Module
Configured for logic execution and communication management in PLC-5 control platforms, the Allen-Bradley 1785-L20B/E (1785-L20B PLC-5 Processor Module) provides direct physical/electrical execution through a 1771 I/O chassis backplane with DH+, Remote I/O, and serial communication interfaces.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1785-L20B/E |
| Brand | Allen-Bradley |
| Origin | USA |
| Module Type | PLC-5 Processor Module |
| Product Line | PLC-5 |
| Weight | 2.60 lbs |
| Operating Temp | 0 deg C to 60 deg C |
| Power Consumption | 12 W |
| Backplane Current | 2.3 A at 5 VDC |
| Processor Type | PLC-5/20 Standard Processor |
| User Memory | 2K words battery-backed (16K words maximum memory specification) |
| Communication Ports | 1 x DH+, 1 x DH+/Remote I/O, 1 x RS-232/422/423 serial port |
| Maximum I/O Capacity | 1024 points (512 inputs and 512 outputs) |
| Chassis Compatibility | 1771 I/O chassis |
| Battery Type | Lithium battery for memory retention |
| I/O Scan Time | 10 ms at 57.6 kbps, 7 ms at 115.2 kbps, 3 ms at 230.4 kbps |
| Status Indicators | Power, fault, and communication LEDs |
| Storage Temperature | -40 deg C to +85 deg C |
PLC-5 Backplane Communication and Firmware Compatibility
The 1785-L20B/E processor module executes PLC-5 control logic through the 1771 chassis backplane interface. The processor manages user program execution, local and remote I/O scanning, and communication exchange through Data Highway Plus, Remote I/O, and serial communication channels.
For Allen-Bradley PLC architecture, the processor depends on backplane bus communication behavior and firmware compatibility between the CPU module, I/O modules, and communication devices. The module supports I/O density scaling within PLC-5 system limits and provides multiple communication paths for distributed control configurations.
The processor supports deterministic PLC-5 network communication through DH+ and Remote I/O links. Firmware flash compatibility and processor revision verification are required when integrating the module into existing PLC-5 installations.
Frequently Asked Questions
Q: What communication interfaces are available on the 1785-L20B/E processor module?
A: The module provides DH+, DH+/Remote I/O, and RS-232/422/423 serial communication interfaces.
Q: How does the 1785-L20B/E retain the user program during power interruption?
A: The processor uses battery-backed memory with a lithium battery for program retention.
Q: What chassis is required for the 1785-L20B/E installation?
A: The module is designed for installation in a compatible 1771 I/O chassis and receives operating power through the chassis backplane.
Field Installation Guidelines
Install the 1785-L20B/E processor module into the assigned 1771 I/O chassis slot and verify correct backplane connector engagement before system startup. Confirm processor revision compatibility with existing PLC-5 I/O modules and communication hardware.
Connect DH+, Remote I/O, and serial communication wiring according to PLC-5 installation requirements. Separate communication cables from high-voltage power wiring and apply appropriate shield grounding practices to reduce electromagnetic interference.
Verify chassis power availability, battery condition, and processor diagnostic LEDs after installation. Confirm I/O addressing, communication parameters, and user program execution before placing the PLC-5 system into operation.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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